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It looks like your router is handling lookups for simple A records but it is not handling lookups for MX records.
Did you try changing the nameserver settings in resolv.conf on the Red Hat machine to the IP addresses of the actual DNS servers supplied by your ISP? That would bypass the router all together.

If God hadn't meant for us to use GUI tools, there wouldn't have been a Xerox PARC.

Originally posted by cowanrl It looks like your router is handling lookups for simple A records but it is not handling lookups for MX records.
Did you try changing the nameserver settings in resolv.conf on the Red Hat machine to the IP addresses of the actual DNS servers supplied by your ISP? That would bypass the router all together.

Thats a great catch - once I changed to the external nameservers everything left the mailq

One more problem - on my mailserver on another machine running exim the log is showing this:

2003-12-22 21:49:55 1AYXw2-0004HV-Il H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:49:56 1AYXw3-0004HV-NN H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:49:58 1AYXw5-0004HV-F0 H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:49:59 1AYXw6-0004HV-J4 H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:00 1AYXw7-0004HV-IX H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:01 1AYXw8-0004HV-NU H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:02 1AYXw9-0004HV-VR H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:04 1AYXwB-0004HV-7D H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:05 1AYXwC-0004HV-Qu H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:06 1AYXwD-0004HV-Ne H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:07 1AYXwE-0004HV-RO H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:08 1AYXwG-0004HV-0V H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:09 1AYXwG-0004HV-SG H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:10 1AYXwH-0004HV-WC H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:11 1AYXwI-0004HV-Vz H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:12 1AYXwJ-0004HV-SQ H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:13 1AYXwK-0004HV-Pj H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred
2003-12-22 21:50:14 1AYXwM-0004HV-CY H=(localhost.localdomain) [195.137.32.58] F=<> temporarily rejected after DATA: all attempts to verify a sender in a header line deferred

That just looks like a default ISP reverse address listing.
It could be possible that there is mail coming in to your server from that IP address. That error message may mean that it is unable to get a satisfactory reverse lookup on the IP address.
If you have your mail server set up to require a reverse DNS lookup before it will accept mail from any server, mail coming in from that server may be rejected.

If God hadn't meant for us to use GUI tools, there wouldn't have been a Xerox PARC.